In a class composed of x girls and y boys, What part of the class is composed of girls

If the operation,^ is defined by the equation x ^ y = 2x + y, what is the value of a in 2 ^ a = a ^ 3

In a group of 15,7 have studied Latin, 8 have studied Greek, and 3 have not studied either. How many of these studied both Latin and Greek

What is the maximum number of half-pint bottles of cream that can be filled with a 4-gallon can of cream(2 pt.=1 qt. and 4 qt.=1 gal)

2 hours after a freight train leaves Delhi a passenger train leaves the same station travelling in the same direction at an average speed of 16 km/hr. After travelling 4 hrs the passenger train overtakes the freight train. The average speed of the freight train was?

If 9x-3y=12 and 3x-5y=7 then 6x-2y = ?

A coffee shop blends 2 kinds of coffee, putting in 2 parts of a 33p. a gm. grade to 1 part of a 24p. a gm. If the mixture is changed to 1 part of the 33p. a gm. to 2 parts of the less expensive grade, how much will the shop save in blending 100 gms.

If the value of x lies between 0 & 1 which of the following is the largest?

There are 12 boys and 15 girls, How many different dancing groups can be formed with 2 boys and 3 girls. Which of the following fractions is less than 1/3

in a class, except 18 all are above 50 years.15 are below 50 years of age. How many people are there

If a boat is moving in upstream with velocity of 14 km/hr and goes downstream with a velocity of 40 km/hr, then what is the speed of the stream?

A car travels a certain distance taking 7 hrs in forward journey, during the return journey increased speed 12km/hr takes the times 5 hrs. What is the distance travelled

Find the value of ( 0.75 * 0.75 * 0.75 - 0.001 ) / ( 0.75 * 0.75 - 0.075 + 0.01)

A can have a piece of work done in 8 days, B can work three times faster than the A, C can work five times faster than A. How many days will they take to do the work together?

If on an item a company gives 25% discount, they earn 25% profit. If they now give 10% discount then what is the profit percentage.

A company contracts to paint 3 houses. Mr.Brown can paint a house in 6 days while Mr.Black would take 8 days and Mr.Blue 12 days. After 8 days Mr.Brown goes on vacation and Mr. Black begins to work for a period of 6 days. How many days will it take Mr.Blue to complete the contract?

In simple interest what sum amounts of Rs.1120/- in 4 years and Rs.1200/- in 5 years?

If 13 = 13w/(1-w) ,then (2w)2 =

A certain number of men can finish a piece of work in 10 days. If however there were 10 men less it will take 10 days more for the work to be finished. How many men were there originally?

Instead of multiplying a number by 7, the number is divided by 7. What is the percentage of error obtained? Find (7x + 4y ) / (x-2y) if x/2y = 3/2 ?

In june a baseball team that played 60 games had won 30% of its game played. After a phenomenal winning streak this team raised its average to 50% .How many games must the team have won in a row to attain this average?

There are 200 questions in a 3 hour examination. Among these questions are 50 mathematical problems. It is suggested that twice as much time be spent on each mathematical problem as for each other question. How many minutes should be spent on mathematical problems?

M men agree to purchase a gift for Rs. D. If three men drop out how much more will each have to contribute towards the purchase of the gift

If a and b are positive integers and (a-b)/3.5 = 4/7, then

Three types of tea a, b and c costs Rs. 95/kg, 100/kg and 70/kg, respectively. How many kilograms of each should be blended to produce 100 kg of mixture worth Rs. 90/kg, given that the quantities of brand b and brand c are equal?